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Home >> GMC >> 2021 >> Terrain SL >> Repair and Diagnosis >> Body & Frame >> Ignition Switch/Steering Lock >> Immobilizer System >> Diagnostic Information and Procedures >> DTC B3978-B3982 >> Circuit/System Verification

Circuit/System Verification

  1. Verify DTC U0100-U02FF is not set.
    • Go to next step: If the scan tool does communicate with the vehicle 
  2. Perform the Programming and Setup procedure for the control module that set the DTC.
  3. Verify the DTC does not set after programming.
    • If the DTC sets after programming 

      Replace the control module that set the DTC.

    • Go to next step: If the DTC does not set after programming 
  4. All OK.
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